2011 Fiscal Year Final Research Report
The evolution of Archean continental roots : An integrated study of crustal and mantle xenoliths and intracontinental high-pressure metamorphic belts of Tanzania
| Project/Area Number |
21340148
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Okayama University |
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Principal Investigator |
TSUJIMORI Tatsuki 岡山大学, 地球物質科学研究センター, 准教授 (00436833)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Katsura 岡山大学, 地球物質科学研究センター, 准教授 (20325129)
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| Project Period (FY) |
2009 – 2011
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| Keywords | タンザニア地塊 / 下部地殻 / リソスフェアマントル / ざくろ石かんらん岩 / グラニュライト / エクロジャイト |
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| Research Abstract |
The lower crustal and lithospheric mantle xenolith suites of the Archean Tanzanian craton show lithological variation from kyanite-bearing high-pressure granulite(rare eclogite) to garnet-bearing peridotites. An integrated study of garnet peridotite xenoliths indicates strongly depleted zone in the lithosphere root at depths of~ 130-145 km ; a few samples suggest an initial stabilization at depths of~ 160 km. Moreover, the study revealed that the cratonic root is pervaded by episodic metasomatic melts, which have interacted with lithospheric mantle beneath the Archean Tanzanian craton. This indicates a physicochemical stratification of the lithospheric mantle beneath the Tanzanian craton.
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Author(s)
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Journal Title
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Journal Title
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Pages: 327-342
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